You can get your PUK Code from your service provider. Should be a
quick call after they verify your account info. Unfortunately there is
not DEFAULT PUK Code and provider is the only one that can tell you
what your SIM PUK was set to.

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does it say sim block? or is it just asking for the PUK?
if the sim card is blocked, you will need to replace your sim card
if the phone is just asking for the PUK, contact your service provider for the PUK
*2767*3855# = Full Reset (Caution every stored data will be deleted.)*2767*2878# = Custom Reset*2767*927# = Wap Reset

Every PUK code is unique so nobody can tell you your PUK number, but i will tell you what you can do!1)
If you still have your packet that your Sim Card came in, you should
find your PUK number in there, if you don't have the packet, please
read bellow.

2) You must get a phone that is on the same network
as your phone and call the networks Customer Care and ask them for your
PUK number, they will ask you for your phone number, then they will
tell you your PUK number. Once you have done this, you will be able to
reset your Pin number so you will be able to go into your phone again.